Method for preventing diesel bearing bearing burnout:
Early damage to sliding
bearings is much more common than bearing burnout, so it is important to prevent early damage to the sliding bearings. Proper maintenance of the sliding bearing is an effective way to reduce the early damage of the bearing and a reliable guarantee to extend the life of the bearing. Therefore, in the routine maintenance and repair of the engine, attention must be paid to the appearance of the alloy surface, the back end, the end and the edge of the bearing. If there is an abnormality or a sign of excessive wear, it is necessary to carefully identify the cause and take corresponding action. The measures to improve the working conditions of the bearing, pay attention to the prevention of early damage to the sliding bearing.
1. Strict measurement of the coaxiality and roundness of the main
bearing bore of the diesel engine body. For the measurement of the coaxiality of the main bearing bore of the machine body, the coaxiality of the diesel engine body must be measured accurately, and the runout of the crankshaft is measured, so that the thickness of the bearing bush is selected, so that the oil lubrication gap is consistent in each axial position. . Where the diesel engine has been crushed, flying, etc., the coaxiality of the main bearing bore of the body must be checked before assembly. The total length of the ductile iron crankshaft is not more than 0.14mm, the total length of the steel crankshaft is not more than 0.12mm, and the body is bored. The roundness and cylindricity are also required. If it exceeds the limit, it is disabled. If it is within the limit, the grinding method is adopted (that is, the appropriate amount of red powder is applied to the bearing bush, and the crankshaft is loaded and then rotated, and then the bearing cap is removed to check the bearing bush, and the hard spot is convex. After the scraping process is performed, the amount of change in size is measured to ensure the reliability of use. Valve inlet pump industrial washing machine
2. Improve the maintenance and assembly quality of the bearings and strictly control the passing rate of the connecting rods. Improve the quality of the hinge of the bearing, ensure that the back of the bearing is smooth and spotless, and the positioning bump is intact;
3, its own elastic opening amount is 0.5 ~ 1.5mm, which can ensure that the bearing bush fits tightly with the bearing housing hole by its own elastic force after assembly;
4. It is required to measure the parallelism and distortion of the new and old connecting rods, and it is forbidden to get on the train for unqualified connecting rods;
5. Each end of the upper and lower bearing bushes installed in the bearing housing should be 30~50mm higher than the bearing seat plane. The high output can ensure that the bearing and the bearing seat are tightly matched after tightening the bearing cap bolt according to the specified torque. Self-locking force, the bearing will not be loose, the heat dissipation effect is good, and the bearing ablation and wear are prevented;
6. The working surface of the bearing can not be measured by the scraping method to achieve 75%~85% contact impression. The matching clearance between the bearing and the journal should be achieved when the scraping is not performed.
7. In addition, when assembling, pay attention to check the machining quality of the crankshaft journal and bearing, strictly implement the repair process specification, prevent the installation from being improper due to improper loading method, and the torque of the bearing bolt is not uniform or does not meet the requirements, resulting in bending deformation. And stress concentration, leading to early damage to the bearing. Method for preventing burning of diesel engine bearings
[Chinese bearing net] 7/19/2010 Author: China Bearing Network
Method for preventing diesel bearing bearing burnout:
Early damage to sliding bearings is much more common than bearing burnout, so it is important to prevent early damage to the sliding bearings. Proper maintenance of the sliding bearing is an effective way to reduce the early damage of the bearing and a reliable guarantee to extend the life of the bearing. Therefore, in the routine maintenance and repair of the engine, attention must be paid to the appearance of the alloy surface, the back end, the end and the edge of the bearing. If there is an abnormality or a sign of excessive wear, it is necessary to carefully identify the cause and take corresponding action. The measures to improve the working conditions of the bearing, pay attention to the prevention of early damage to the sliding bearing.
1. Strict measurement of the coaxiality and roundness of the main bearing bore of the diesel engine body. For the measurement of the coaxiality of the main bearing bore of the machine body, the coaxiality of the diesel engine body must be measured accurately, and the runout of the crankshaft is measured, so that the thickness of the bearing bush is selected, so that the oil lubrication gap is consistent in each axial position. . Where the diesel engine has been crushed, flying, etc., the coaxiality of the main bearing bore of the body must be checked before assembly. The total length of the ductile iron crankshaft is not more than 0.14mm, the total length of the steel crankshaft is not more than 0.12mm, and the body is bored. The roundness and cylindricity are also required. If it exceeds the limit, it is disabled. If it is within the limit, the grinding method is adopted (that is, the appropriate amount of red powder is applied to the bearing bush, and the crankshaft is loaded and then rotated, and then the bearing cap is removed to check the bearing bush, and the hard spot is convex. After the scraping process is performed, the amount of change in size is measured to ensure the reliability of use. Valve inlet pump industrial washing machine
2. Improve the maintenance and assembly quality of the bearings and strictly control the passing rate of the connecting rods. Improve the quality of the hinge of the bearing, ensure that the back of the bearing is smooth and spotless, and the positioning bump is intact;
3, its own elastic opening amount is 0.5 ~ 1.5mm, which can ensure that the bearing bush fits tightly with the bearing housing hole by its own elastic force after assembly;
4. It is required to measure the parallelism and distortion of the new and old connecting rods, and it is forbidden to get on the train for unqualified connecting rods;
5. Each end of the upper and lower bearing bushes installed in the bearing housing should be 30~50mm higher than the bearing seat plane. The high output can ensure that the bearing and the bearing seat are tightly matched after tightening the bearing cap bolt according to the specified torque. Self-locking force, the bearing will not be loose, the heat dissipation effect is good, and the bearing ablation and wear are prevented;
6. The working surface of the bearing can not be measured by the scraping method to achieve 75%~85% contact impression. The matching clearance between the bearing and the journal should be achieved when the scraping is not performed.
7. In addition, when assembling, pay attention to check the machining quality of the crankshaft journal and bearing, strictly implement the repair process specification, prevent the installation from being improper due to improper loading method, and the torque of the bearing bolt is not uniform or does not meet the requirements, resulting in bending deformation. And stress concentration, leading to early damage to the bearing.
